I suggest you ...

Create a desktop application for OS X, Linux, and Windows

Just signed up and -love- the service and simplicity. Very well done, guys!

I have a strong desire to have the SAME application for e-mail on Windows, OS X and Linux, as well as my iPhone and Android devices. I know that's a lot of platforms to support, but if you were able to leverage some of the code behind GitHub's Atom editor (github.com/atom/atom), you might be able to bring a desktop client out for OS X/Windows/Linux much more quickly by leveraging your existing web app.

All things considered however, this is a great service that I really like. Way to go!

We are happy to inform you that we have started to build desktop applications for OS X, Linux and Windows. Desktop clients will enable you to import emails to your encrypted Tutanota mailbox as well as give you offline access. Building desktop clients is an extensive project, so we cannot give an exact ETA.

I wouldnt mind donating a lump sum, or even upgrading my tutanota account but there is no true anonymous source of payment available, it's in my understanding that you keep these payment details on record if one is upgrading to a full paid Tutanota service. It's a shame because you could be losing out on a lot of money from many potential clients due to this not being at all private.. I would love to send some cash or even a bank deposit... if possible.. If you can please tell me how I able to upgrade my account without bearing any of my financial institutions information to you.

I'm not sure why we need a desktop client at all - seems very last century tbh. Huge support overheads for one platform, let alone 3 client OSes! If you look at what Microsoft and Google have been able to achieve with online applications, you can see what is possible (and desirable)

Desk top version would be much appreciated, because I could find a way of printing out an email at least.
I cannot print anything off iOS/iPhone, so I stopped switching my contacts to my Tutanota as I am now onsidering getting something more user-friendly (although I very much like your security standards).
I understand that you are still growing, but come on, printing is a basic function, like a college 101 course.